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Condensed Consolidating Financial Information - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval   $ 500
Genworth Financial's Subsidiaries [Member]    
Restricted net assets $ 14,000  
Genworth Holdings Subsidiaries [Member]    
Restricted net assets $ 12,700